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Table 4 HPLC analysis of phenolic compounds in CBW experiments

From: Energetic and biochemical valorization of cork boiling wastewater by anaerobic digestion

Phenolic compound (μg mL-1)

CBW

AD0

AD3

AD6

Gallic acid

19.50 ± 3.71

4.17 ± 0.26

15.47 ± 4.08

22.43 ± 3.97

Protocatechuic acid

8.50 ± 1.02

0.64 ± 0.09

5.07 ± 1.59

9.82 ± 1.33

Caffeic acid

2.14 ± 0.15

0.59 ± 0.44

1.15 ± 0.21

1.77 ± 0.36

Vanillic acid

2.00 ± 0.19

tr

1.15 ± 0.37

1.91 ± 0.36

Syringic acid

tr

nd

tr

1.10 ± 0.99

Ellagic acid

96.50 ± 11.50

2.49 ± 0.39

22.3 ± 3.48

41.80 ± 8.49

p-Coumaric acid

4.10 ± 0.26

1.10 ± 0.18

1.77 ± 0.28

2.47 ± 0.40

Ferulic acid

6.50 ± 0.78

1.02 ± 0.08

1.55 ± 0.37

5.60 ± 0.98

o-Coumaric acid

3.80 ± 0.29

tr

1.17 ± 0.32

4.51 ± 0.33

trans-Cinnamic acid

3.70 ± 0.37

2.16 ± 0.26

2.10 ± 0.29

3.13 ± 0.63

  1. Values presented as an average ± standard deviation. AD0, blank anaerobic digestion assay; AD3, anaerobic digestion assay at 3 kg COD m-3 of CBW; AD6, anaerobic digestion assay at 6 kg COD m-3 of CBW; CBW, cork boiling wastewater, reactor influent; HPLC, high performance liquid chromatography; nd, not detected; tr, traces.